Method of dewatering a wet process phosphoric acid slurry

Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing

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423321R, 210733, C01B 2516, B01D 2101, B03D 300, C02F 100

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051851350

ABSTRACT:
A digested slurry from a wet process phosphoric acid production process is dewatered by gravity-assisted vacuum filtration using as a filtration aid an aqueous solution of a polymeric filtraton aid that has been subjected to high shear mixing to enhance the performance of the filtration aid and enhance the filtration.

REFERENCES:
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patent: 4800071 (1989-01-01), Kaesler et al.
patent: 5009873 (1991-04-01), Kerr et al.
"Effect of Shear on Polymer Aided Flocculation of Suspensions", Nicholas D. Sylvester and Mousa P. Toure, Ind. Eng. Chem. Prod. Res. Dev., vol. 17, No. 4, 1978, pp. 347-351.
"Factors Effecting a Loss of Flocculation Activity of Polyacrylamide Solutions: Shear Degradation, Cation Complexation, and Solution Aging", J. M. Henderson and A. D. Wheatley, J. Applied Polymer Science, vol. 33, pp. 669-384 (1987).
"Aging and Loss of Flocculation Activity of Aqueous Polyacrylamide Solutions", W. P. Shyluk and F. S. Stow, Jr., J. Applied Polymer Science, vol. 13, pp. 1023-1036 (1969).
"Coagulation and Flocculation in the Mining Industry", L. J. Connelly and P. F. Richardson, AlChE symposium presentation, Oct. 10, 1984, reprint.
"Coagulation and Flocculation", Nalco Water Handbook, Second Ed., 1988, McGraw-Hill Book Co., pp. 8.3 to 8.23.
"Phosphates, Phorphorus; Fertilizers, Potassium Salts, Natural Organic Fertilizers, Urea", J. Q. Hardesty and L. B. Hein, Riegel's Handbook of Industrial Chemistry, Van Nostrand Reinhold Co., 1974, pp. 537 to 548.
"DeWatering", Kirk Othmer Encyclopedia of Chemical Technology, Supplement vol., pp. 310 to 324, 1984.
Literature Search Report No. 3558, pp. 1-18, Mar. 1991.

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